Disston Screwdiggers fulfil the same function as Screwsinks but the countersinking part can be slid up and down the drill part of the tool. This means, for example, that a No.8 Screwdigger can be adjusted to predrill for different lengths of No. 8 Screw. This set contains 1 each No. 6,8,10 & 12 screwdiggers. https://elecena.pl/product/27256190/disston-d5211-screw-digger-set-4 2024-11-13 https://elecena.pl/product/27256190/disston-d5211-screw-digger-set-4 2025-03-26